Working with the BinaryWriter Class

   

using System;
using System.IO;
   
class MainClass
{
    static public void Main()
    {
     FileStream BinaryFile = new FileStream("test.dat", FileMode.Create, FileAccess.ReadWrite);
     BinaryWriter  Writer = new BinaryWriter(BinaryFile);

     Writer.Write('a');
     Writer.Write(123);
     Writer.Write(456.789);
     Writer.Write("test string");
    }
}